A radial-mixing exhaust gas recirculation mixer is disclosed having an air supply passage having a convergent portion. An exhaust gas recirculation passage within the convergent portion includes a nozzle having a terminal end. A mixing tube is arranged downstream from the air supply passage and at least a portion of the exhaust gas recirculation passage. A mixing element is disposed in the mixing tube. In one example, a divergent portion is arranged downstream adjoining the mixing tube to increase the pressure of the mixture after the mixing tube. In one example, the exhaust gas recirculation mixer is arranged within an engine such that the air supply passage is in fluid communication with an intake manifold. The exhaust gas recirculation passage is in fluid communication with an exhaust manifold to recirculate a portion of exhaust gas to the intake manifold.
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1. An exhaust gas recirculation mixer comprising:
an air supply passage having a convergent portion including a tapered portion terminating at a distal end of the convergent portion;
an exhaust gas recirculation passage within the convergent portion and including a nozzle having a terminal end substantially axially aligned with the distal end of the convergent portion;
a mixing tube downstream from the air supply passage and at least a portion of the exhaust gas recirculation passage, the mixing tube attached to the distal end of the convergent portion; and
a helical mixing element disposed in and extending axially within the mixing tube, the helical mixing element bending at least 90 degrees around a central longitudinal axis of the mixing tube.
9. An engine comprising:
at least one cylinder;
an intake manifold and an exhaust manifold fluidly connected to the cylinder;
an air supply passage having a convergent portion upstream from the intake manifold;
an exhaust gas recirculation passage within the convergent portion and in fluid communication with the exhaust manifold, the exhaust gas recirculation passage including a nozzle having a terminal end;
a mixing tube disposed downstream from the terminal end; and
a mixing element disposed within the mixing tube, the mixing element including a first helical element having a first leading edge and a second helical element having a second leading edge, the first and second helical elements bending around a central longitudinal axis of the mixing tube, the second helical element being located downstream from the first helical element and adjacent to the first helical element, the second leading edge of the second helical element being rotationally offset from the first leading edge of the first helical element.
2. The exhaust gas recirculation mixer according to
3. The exhaust gas recirculation mixer according to
4. The exhaust gas recirculation mixer according to
5. The exhaust gas recirculation mixer according to
6. The exhaust gas recirculation mixer according to
7. The exhaust gas recirculation mixer according to
8. The exhaust gas recirculation mixer according to
10. The engine according to
11. The engine according to
12. The engine according to
13. The engine according to
14. The engine according to
15. The exhaust gas recirculation mixer according to
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This application claims priority to U.S. Provisional Application No. 61/144,241, which was filed on Jan. 13, 2009.
This disclosure relates to an ejector-type exhaust gas recirculation (EGR) mixer for use with a diesel engine, for example.
EGR has been demonstrated to be an effective method for reducing NOx emissions from diesel and gasoline engines. For the turbo-charge direct injection gasoline engine, EGR is also often needed for controlling the engine knocking. EGR and air are mixed in an EGR mixer before the charge enters the engine cylinders.
The conventional EGR mixers are axial mixers, where the EGR introduced into the mixer is in co-flow with air along the axis of the mixer and the mixing is based on diffusion and/or dispersion. Venturi-type EGR mixers and multi-hole co-flow EGR mixers are all axial mixers. For these type mixers, the required mixing length L is generally longer than ten times of the mixing section diameter d (i.e., L/d>10) to achieve an acceptable mixing quality. Long mixing lengths are difficult to package for most applications.
A radial-mixing exhaust gas recirculation mixer is disclosed having an air supply passage having a convergent portion. An exhaust gas recirculation passage within the convergent portion includes a nozzle having a terminal end. A mixing tube is arranged downstream from the air supply passage and at least a portion of the exhaust gas recirculation passage. A mixing element is disposed in the mixing tube. In one example, a divergent portion is arranged downstream adjoining the mixing tube to increase the pressure of the mixture after the mixing tube. In one example, the exhaust gas recirculation mixer is arranged within an engine such that the air supply passage is in fluid communication with an air compressor. The exhaust gas recirculation passage is in fluid communication with an exhaust manifold to recirculate a portion of exhaust gas to the intake manifold.
The disclosure can be further understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
An engine 10 is illustrated in
The engine 10 includes cylinders 12 are supplied air through an intake manifold 14. Exhaust gases are expelled from the cylinders 12 through an exhaust manifold 16. An EGR passage 18 circulates a portion of exhaust gases from the exhaust manifold 16 to the air supply passage where it is intermixed in a mixing region 20. In one example, a compressor 19 is arranged between and inlet 22 and the intake manifold 14 to pressurize air entering the cylinders 12. The compressor 19 is driven by a turbine 17 rotated by exhaust gases from the exhaust manifold 16, for example.
To reduce undesired emissions of the engine 10, it is desirable to mix the EGR thoroughly with the air before entering the combustion chambers of the engine 10. An example EGR mixer 24 is illustrated in
The mixing tube 34 has a length 46 and a diameter 48. In one example, the convergent portion 32 has a length 74 approximately 1.5 times the diameter 48, and the divergent portion 44 has a length 76 approximately 3 to 4 times the diameter 48. The divergent portion 44 increases the pressure of mixture after the mixing tube 34 like an ejector. In one example, the diameter 48 is less than approximately ⅓ the length 46 and, for example, 2 times the length 46. A mixing element 42 is arranged within the mixing tube 34 to encourage homogeneous mixing of the EGR with the air in the relatively short distance of the mixing tube 34. In the example illustrated in
Referring to
Referring to
Referring to
Although an example embodiment has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of the claims. For that reason, the following claims should be studied to determine their true scope and content.
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